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15 - ? - 13 = 2, 5 - 14 - ? = 9, 2 - 5 - ? = 3, 9 - 13 - ? = 4, 17 - ? - 4 = 13, 10 - ? - 4 = 6, 7 - ? - 2 = 5, 0 - 2 - ? = 2, 16 - 20 - ? = 4, 1 - 8 - ? = 7, 11 - ? - 7 = 4, 6 - 19 - ? = 13, 18 - ? - 5 = 13, 3 - 11 - ? = 8, 12 - 15 - ? = 3,

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